Photographic cartridge



May a, 1923. r l,45 4,814 4 J. G. JONES RRRRRRRRRRRRRRRRRRR GE ,APET ELS f nmmnn f $1210 aflfones;

INVENTOR ATTORNEYS.

Patented May 8, 1923.

stares JOHN G. J ONES, OF ROCHESTER, NEW YORK, ASSIGNOB TO EASTMAN KODAK COMPANY,

OF ROCHESTER, NEW YORK, A CORPORATION OF NEW,YORK. y

PHOTOGRAPHIC CARTRIDGE.

Application filedJuly 25, 1921. Serial No. 487,449.

To all whom it may concern:

Be it known that I, JOHN G. JONES, a citizen of the United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Cartridges, of which the following is a full, clear, and exact specification.

This invention relates to photographic roll film cartridges of the type commonly used in cameras and comprising a roll film and protective paper therefor.

More particularly this invention has for .its object the elimination of the fault commonly known as edge fog'which results from the undesired leaking of light into the margin or border of a roll film. In my co-pending application Serial No. 487,447, filed July 25, 1921, I have disclosed the use of a protective paper having portions of varying flexibility which permit the paper, even though wider than the distance between the flanges, to buckle or be compressed .upon itself, thus forming light locks at the ends of the spool.

This application relates to certain modifications of this principle, and more particularly to protective paper in which the greater flexibility is obtained by serrating the edges of the protective material.

It is obvious that modifications embodying the invention as defined in the appended claims are possible, and I have described certain of these which are shown in the figures in the drawing, to which reference will now be made. Those parts which are the same in the various figures bear the same reference characters in each.

Fig. 1 is a perspective view of a partially unwound film cartridge, the leader strip being broken away;

Fig. 2 is an elevation showing the film and backing paper entirely unwound from the spool;

Fig. 3 is an elevation showing the film with lead strips only;

Fig. at is an elevation of one end of a modified form of backing paper;

Fig. 5 is an elevation of one end of another modified form of protective paper;

Fig. 6 is a fragmentary view showin a section of protective paper with a modified form of edge;

It is to be understood that the figures are not drawn to scale, but are so dimensioned -1 is serrated at its edges 2, preferably throughout its length and the greatest total width of the backing paper is greaterthan the distance between the'fianges B of the spool upon which it is wound. i

It is to be understood that the backing paper extends the full length ofthe film and beyond it at each end to form safety leader strips, as indicated at 3 in Fig. 2. The rear endv of the film also has a sticker band S "which is not, however, ordinarily attached tolghe backing paper when the cartridge is so i The serrations may be regular, as indi cated inFig. 1, each one having the same depth and width, or they may be, and pref erably are,"somewhat irregular, as indicated at 4 in Fig. 2, the tops of the serrations on each edge lying in a common line, but the distance from top to top being variable; I find this irregular arrangement preferable,

serrations lying directly one over the other, so as to make a kind of channel down-the edge of the paper between it andthe flange.

Instead of interwinding the protective material andthe paper, as isdone when a backing paper, such as is shownin Figs. 1 and 2 is used, lead strips only 'may be used with the film, this being shown'in Fig. 3, where the film is attached by stickers S to the lead strips 5 having their edges serrated at 4 similar to the edges shown in Fig. 2.

If desired, however, a backing paper may be used which extends the full length of the film and may be interwound therewith, in which the intermediate portion 6 which lies opposite to the film in use is narrower than the end strips 7, the latter only being serparticularly the features of r because there is less likelihood of a series ofv rated as shown in Fig. 4. This figure also 1 scribed, the backing paper is of uniform thickness, the flexibility of the marginal portion being obtained only by the decrease of volume obtained by the indentations, the greater flexibility and decrease in volume may be obtained by combining with the serrated edge a thinned, chamfered, or beveled edge, as indicated in Fig. 6. In this the protective paper 12 gradually decreases: at its edge from its greatest thickness at 13 in a gradual bevel, as indicated at 14 to an irregular edge, as indicated at 15, the decrease in volume and, the increase in flexibilty of the margin being obtained both by the beveling and by the serration thereof.

It is obvious that in each of the forms described there is a band of coiled filmaround the outside of which is a band of protective material, at least one edge of which is serrated. The buckling or friction of the outer pointsof the serrations under slight pressure will form a light tight-lock between the edges of the paper and the inner surfaces of the flanges.

'VVhile I do not limit myself as regards the dimensions, shape and uniformity of the serrations, I find that satisfactory results are obtained if the total width of the backing paper is about .04 wider than the distance between the flanges, andthe serrations made of a depth of about .03 and an average distance between the tops of the serrations of about .05, it being understood-that theabove dimensions are merely illustrative examples, the dimensions varying more or less with the size of the cartridge, the above data being for paper out about 8-1; wide.

Claims:

1. An article of manufacture, comprising a spool with end flanges, a band of photographic film wound thereon, sheet protective material attached to the film and constituting end strips wound on the spools inside the film and outside thereof, at least one side margin of each end strip being serrated and the width of the end strips being greater than the distance between the flanges.

2. An article of manufacture, comprising a roll of sensitized material, a support therefor comprising spaced end flanges, and a strip of protective material with a serrated side edge wound around said sensitive material, said strip being wider tha the distance between said flanges.

3. An article of manufacture, comprising a spool with end flanges, sensitized ma.- terial and protective paper interwound thereon, the paper having serrated side edges and being of uniform thickness and wider thanthe. distance between the flanges.

4. An article of manufacture, comprising a spool with end flanges, a band of sensitized'film and a band of protective paper interwound' thereon, the paper band being longer than the other band and its ends having side edges serrated, the width of the-said ends being greater-than the distance between the flanges.

5. A photographic film cartridge comprising a spool with end flanges, sensitized film and protective paper interwound thereon, the paper throughout its length having irregularly serrated side edges and being widerthan the distance between the flanges.

6. A photographic filmcartridge comprising a spool with end flanges, a band of photographic filmv and a band ofprotectlve paper interwo-und thereon, the paper band being longer than said film band and attachedthereto and-constituting end strips, the paper band throughout its' length being wider than the distance between the flanges and having serrated side edges, and being of uni-form thickness throughout.

7. A photographic'film cartridge comprising coiledbands comprising sensitlzed material and protective material, a support therefor comprising spaced end flanges, said protective material being of uniform thickness and having its side edges serrated throughout :its length.

Signed at Rochester, New York, this 21st day of July, 1921.

JOHN e. JONES. 

